Die-stock.



J. A; PHELPS.

DIE S TOG K. APPLICATION FILED JLY 31. 1911.

Patented Aug. 20, 191

3 SHBBTS SHBET 1.

J. A. PHELPS= DIE STOCK. APPLICATION FILED JULY 31, 1911.

"U ITED STATES PATENT. OFFICE.

. JAMES A. rnnnr's, or CLEVELAND, OHIO.

To-clzwhom may concern:

I 3e it known that I, JA Es A. PHELPs, a citizen of the' United States, residing at Oleveland, in the county of Guyahoga and State of Ohio, have invented certain new and itseful improvements in Die-Stocks, 1 of 'kwhich the following is a specification. j The invention relates to .die stocks for 4 cutting. screw threads .upon cylindrical bars andlpipes.v

;The objects of this invention are to pro-- V1d8 novel means for receding the. dies as the thread iscut to form tapered threads; to provide means for retracting the dies from the work after the thread has been cut @tope'rmit theready removal of the die stock gfrom the work; to providemeans for chang-. ingthe dies to cut threads on various sized.

.pipes and bar-sin connection with the foreso e means for preventing the chips from work- '1 ing between the said parts.

With the above and other objects in view this invention is embodied in the construction, arrangement and combination of partsv as hereinafter described and claimed and [aslshown in. the accompanying drawings, in

which similarreference characters indicate similar parts, and in'which,- I Figure-lie a-front'view of the die stock.

"Fig. 2is a sectionon the line 2-2 of Fig. 1,

parts being shown in moved position for purpose of clearness. Fig. 3 is a view t'a'ken 111' a diagonal position between the top and side as indicated by the arrow 3 in Fig. 1,

. beingisho-wn as telescoped;

be given an outward and inward'thrust by thecam plate 7 to engage or release the work to l' o'l'd-- the work-and body securely together. 'This device beingold in the art is therefore not described in detail and is just shown as a..means for. securing the work and body together. Concentric annular recesses 8 and 9 are formed in the front end of the body which form an annular wall 12' or common wall'of the.recesses. This wall .12: projects beyond the remainder of the Specification of Letters Patent;

. I v I .20 1912. I Application filed July 31; 9.11. Seria1 No.641,63 5.

feature; and to provide an oil res-- ervmr. for lubricating the rotatingparts and DIE-STOCK.

Patented Au form a communicating passage between the two recesses 8 and 9 which form oil reservoirs. A su table valve or cap passes through the body 5 from the exterior thereof the recess 8 to provide an inlet for inectmg oil or the like-into the recess 8. The

oil'also enters recess 9 through the duct 11.

14 indicates the die holder, being annular shape and having therear tubular exten- S1OI1 which has external screw threads internal screwthreads cut therein. The

sleeve 13 is in screw'threaded engagement with the external surface of the wall 12, while the tubular extension 20 of the die holder is in engagement with the internal threads of the wall 12. The rear ends of into the respective recesses 9 and -8. The pitch of the threads of the extension 20 are the same as the pitchof the thread cut by the dies 19 thu'sas the die holder is turned the sameis led inward'to properly lead the dies 19 on the work, while the-pitch of the 1 threads on the sleeve 13 is slightl less than the pitch of the threads on the sai extension whereby the said sleeve moves a little slower longitudinally than the die holder as the die holder is -turned, for the purpose here in'after described.

An annular plate 27 is arranged iii-front of the die holder 14 and has an annular the recess 15 of the die holder. An outer the extension 20 and sleeve 13 fit snugly channel 40 in the rear face thereof adjacent v ring 26 and an inner ring 24' fit snugly within the outer and inner side walls, re-- spectively, of the channel 40' and are secured rigidly to the outer end of the d e holder 14 by means'of screws 35. These rings 24- and 26 receive between them a cam ring or plate 45 having four cams or cam leaves 47 on the rear face thereof. These cams are center as has been heretofore used but dibelngscrew 'threaded on its outer end; The

verge outwardly toward their rear ends.

The dies 19 have correspondingly shaped notches 48 into which .the said cams fit;-

' A plurali'ty of studs 17, preferably four, pass through arcuate slots 50 in the die holder from the groove 16 into the recess 15' and have reduced inner ends 18 which are screw threaded and engaged in the front end of. the sleeve 13 to make the studs 17 rigid'therewith. Bolts 21 pass throughthe,

plate 27 from the front face thereof in alinement with studs 17 and have the reduced inner ends 23 which are screw threaded into the outer ends of the studs 17 The body of the bolts 21 are smaller in diameter than the studsl'? and a washer 22 is arranged on each bolt 21 and seats on the stud 17. These bolts 21 also passthif'ough the arcuateslots 39 in the cam-ring 45. Thus'the'plate 27 and sleeve 13 .are made to'revolve together but the plate and sleeve having a longitudinal slidable and limited rotary movement withrespect to the die holder. The cam ring 45 has a limited rotatable movement with'respect to the plate 27 and die holder 14 as allowed by the slots 39 but this can'r ring isheld'snugly against the plate 27 by the washers 22. 1

The card ring'45 has aradial slot 25 in its lower end in which projects the eccentric lug 42 of the head 46 which is screwthreaded into the plate 27. This' he'ad 46 has a handle 28 for turning same and as it is turned the eccentric lug 42 working in slot 25 causes the rotation of the cam ring 45 to move the dies 19 radially to or from the center ofthe device to engage or disengage the work, the cams 47 sliding laterally in the notches 48 of the dies to move the same. This forms convenient means for retracting the dies from the work when the cut on the work.

An eye 41 is arranged on the top of the die holder 14 and a lip 30 is arranged on the upper endof the plate 27 in front 'of theeye- 41 and has an ,arcuate slot therein.

thread has been A pin 33 passes through the eye 41 and has.

the front end thereof butting'against the lip 30 and has a reduced extension 29 ass ing through the ar-cuate slot in the lip 30,

29 to clamp the lip 30 tightlybetween the ointer 36 and the pin 33 thus holdin the pon P a plate 27 rigid with the die holder 14.

oosening thenut 37, the plate 27 can be moved or revolved to carry the .cam

with" same to adjust the dies 19 for various sizes of stock, a scale of graduations being arranged on the plate 27' upon which the pointer 36 indicates the size to which the dies have been set. The nut 37 is then'tightened' and the device is ready for use. This mechanism forms suitable means for chang- 1n the size of the threads to be out.

.' n operation, the bod 5 is secured on the.

described. the plate 27, cam ring 45, sleeve' 13 and die holder all being rotated in unison. As the die holder works its way backward, the sleeve 13 movesslower or has' a slower rate of longitudinal movement thus causing the plate 27 and cam'ring 45 to be gradually forced longitudinally away f om the die holder. As the cam ring 45 oves outward. the dies are caused to cli toward the ends of the cam to recede lowly from the center thus cutting a apered thread on the work. When the thread-has been cut on the work the handle 28 is turned to swing the camring 45 and the diesare :retracted from the work The die holder is reversed to bring it to normal position and the body Shaving been removed from the work and handle 28 having been turned back leaves the devic readv fora new operation.

It will be see that the sleeve 13 and tubular extension 20 telescope into the recesses 8 and 9 and the. threads are lubricated by the oil contained within the said recesses. They are-also in this manner protectedfrom chips cut from the work. The objects are inthis manner attained in an efficient and novel manner, it being understood that this de v1ce is susceptible of alterations in its con struction,

vention. It is also understood that instead of rotating the die holder and dies the work a arrangement and comb nation within the scope of the appended claims" without departing fromthe spirit of the inand work, holder may be rotated 'whiohisa reversal of operation.

Having'described my invention, what I claim as new is 1. In a die stock, a work holder, ,a die 12o holder rotatably mounted thereon "to 'move" ro'ngitudinally, a die carried; by the 'die holder, and a member rotatable with the die-1 holder and movable at a different rate of longitudinal speed and connected to thedie' .to move same radially.

holder rotatably mounted thereon to move longitudinally, a .die carried by the die holder and a cam'plate rotatable with the 2. In a die stock, a work holder, a-dievmerit with the work holde'r,

holder having a screw threaded en agement therewith, a die carried by the die holder, :1 member having a screw threaded engage- I e pitches of the above mentioned screw th eads being varied, and operative means connected to the said member and die to move the die radially upon the die holder being rotated.

at. In a. device of the character described, the combination of ,a work holder having concentric annular recesses in the front end thereof, a die holder and a sleeve having a vscrew threaded engagement with the wall between the recesses and adapted to telescope into the said recesses, the screw threadsot' the respective parts being varied in pitch, dies carried by the die holder, and an operative connection between the said sleeve and dies for moving the dies radially upon the die holder and sleeve being rotated.

5. In a device of the character described, the combination of a work holder, a die holder having a screw threaded engagement therewith, a die carried by the die holder, a member having a screw threaded engagement with the work holder, the pitches of the above mentioned screw threads being varied, and a cam plate movable with the said member and having a cam which diverges away from the center of the work holder toward one end thereof,the said cam being engaged to the said die.

6. In a device of the character described, the combination of a work holder, a die holder rotatably mounted thereon, a die carried by the die holder, a plate rotatable with the die holder and having a longitudinal movement therewith, a cam plate caried longitudinally with the said plate and rotatable therewith having a cam thereon which curves laterally away and diverges toward one end from the center of the die holder and which engages the said die, means for moving the said plate longitudinally with respect to the die holder upon the die holder being rotated, and means for rotating the cam plate with respectto the said plate.

7. In a device of the character described, the combinationof a work holder, a die holder rotatably mounted thereon, a die carried bythe die holder, a plate rotatable with the die'holder and having a longitudinal movement therewith, a cam plate carried longitudinally with the said .plate and rotatable therewith having a cam thereon which curves laterally away and diverges toward one end from the "center of the die holder and which engages the said\ die, means for moving the said plate long'tu dinally with respect to the dieholder pon the die holder being rotated, means for rotating the cam plate with respect to the said plate, and means for adjusting the said plate with respect to the die holder die therein.

8. A device of the character described comprising a work holder, 2, die holder having a screw threaded engagementwith the work holder, a die carried by the' die' holder, a sleeve concentric with the die holder and having a screw threaded engagement with the work holder, the screw threads'of the die holder and sleeve being varied in pitch, .a plat mounted to move with the said sleeve, a cam ring mounted to move with the said plate and having a cam thereon which curves laterally away and diverges toward. one end from the center of the die holder and which engages the said the and means for rotating the cam ring'with respectto the said plate. 1

9. A device of the character described comprising a work holder, a die holder having a screw threaded. engagement with the work holder, a die carried by the diaholder, a sleeve concentric with the die holder and having a screw threaded engagement with to adjust the the work holder, the screw threads of the die holder and sleeve being varied in pitch, a plate mounted to move with the said sleeve, a cam ring mounted to move with the said plate and having a cam thereon. which curves laterally away and diverges toward one end from the center of the die holder and which engages the said die, means for rotating the cam ring with respect to the said plate, and means for adjusting the said plate with respect to thedie holder to adjust the die therein.

In testimony whereof I aflix my signature in presence of two witnesses.

JAMES A. BHiJLPs.

Witnesses LEW BosENsTocK, LOUIS G. ROSENSTOCK. 

